feat: add support jira-cli

[antoniomdk]

Summary

• Add rtk jira command that proxies jira-cli with token-optimized output filtering (70-80% reduction on list/view commands)
• Auto-injects --plain/--no-input flags to prevent TUI/interactive mode, making it LLM-agent-friendly
• Includes dedicated Rust module, TOML fallback filter, rewrite hook integration, and comprehensive tests

What's included

New command: rtk jira

Subcommand	Strategy	Estimated Savings
issue list	Auto --plain, collapse tab padding, truncate summaries	60-80%
issue view	Strip ANSI codes, blank lines, Jira footer	50-85%
epic list	Auto --table --plain, compact columns	60-75%
sprint list	Auto --table --plain, compact columns	60-75%
issue create/edit/move/assign	Passthrough with --no-input auto-injection	0% (mutation safety)
me	Passthrough (tiny output)	0%
Other subcommands	Generic passthrough with tracking	0%

Files changed (9 files, +698 lines)

File	Change
src/jira_cmd.rs	New — 547 lines: subcommand routing, 3 filter functions, helpers, 20 unit tests
src/filters/jira.toml	New — TOML fallback filter with 3 inline tests
src/main.rs	Commands::Jira enum variant + dispatch + is_operational_command
src/discover/rules.rs	Rewrite PATTERN + RULE for hook integration
src/discover/registry.rs	4 classification tests + rewrite tests
src/toml_filter.rs	Updated filter count + expected names
README.md	Jira usage section
CLAUDE.md	Module Responsibilities table entry
CHANGELOG.md	Unreleased entry

Hook integration

When rtk init is active, the PreToolUse hook automatically rewrites:

jira issue list --plain  →  rtk jira issue list --plain
jira sprint list --current  →  rtk jira sprint list --current

Unsupported subcommands (board, project, open) are intentionally excluded from rewrite — they pass through without RTK wrapping.

Testing

• 786 tests pass (cargo test --all), 1 pre-existing failure unrelated to this PR
• cargo fmt --all --check ✅
• cargo clippy --all-targets ✅ (0 new warnings)
• 20 new unit tests in jira_cmd.rs covering filter functions with real jira-cli fixture data
• 3 inline TOML filter tests
• 4 classification tests + expanded rewrite tests in registry.rs
• Savings assertions validate ≥20% character reduction on list output, ≥50% on view output

Design decisions

• Follows gh_cmd.rs pattern — Same subcommand routing, tracking integration, error handling, and passthrough strategy
• Tab collapse: jira-cli --plain output uses variable-width tab padding between columns. filter_table_output splits on \t and filters empty segments to extract actual field values
• ANSI stripping: issue view output contains ANSI escape codes even with --plain; stripped via lazy_static regex
• No new dependencies: Uses only existing crate dependencies (anyhow, regex, lazy_static)